VPN-7540: add optional button to info card

[mcleinman]

Description

For #11169. Let me know if you'd like any changes. The button is definitely visually prominent - for your use case this seems okay (we really want the user to click the button and do the action), but it may not be appropriate for all cases.

I also reworked the button a bit to move the height into the MZInformationCard (the card should worry about its height), and removed a long-time annoyance of a double divider line in a dev menu.

As you can see from the example, there are two new fields:

_buttonText: "Tap for alert"
_buttonAction: function() { MZErrorHandler.requestAlert(MZErrorHandler.GeoIpRestrictionAlert) }

Without _buttonText, the info cards look the same as they did before. I've confirmed there are no regressions on any usage of the MZInformationCard.

New version:

No regressions:

Reference

VPN-7540

Checklist

• My code follows the style guidelines for this project
• I have not added any packages that contain high risk or unknown licenses (GPL, LGPL, MPL, etc. consult with DevOps if in question)
• I have performed a self review of my own code
• I have commented my code PARTICULARLY in hard to understand areas
• I have added thorough tests where needed

[strseb]

That is LOVELY! Thank you!!